A 4-day-old term boy, discharged home yesterday and feeding well until this morning, has vomited four times in…

Question

A 4-day-old term boy, discharged home yesterday and feeding well until this morning, has vomited four times in six hours. The vomit is dark green. He passed meconium at eight hours of age and had a normal soft stool an hour ago. He is alert, afebrile and well perfused, and the abdomen is soft and not distended. Blood glucose and venous gas are normal. Which one of the following investigations should be arranged urgently?

Accepted Answer

Upper gastrointestinal contrast study

Answer

Abdominal ultrasound for pyloric thickness

Answer

Serum ammonia and plasma amino acids

Answer

Sweat chloride test

Answer

Urine microscopy and culture

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